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' (No Model.) I I 2 Sheets'--.8hee t'2. I. F. KEARNS, F. BAIER & G. P.WEBER.

'Spinning Lathe. No. 240,145. Patented April 12,1881.

MFETEFS, PHOTO-LITHOGRAPNER, WASmNGTON, 0 c.

UNITED STATES PATENT OFFICE.

ISAAC F. KEABNS, FRANK BAIER, AND CHARLES F. WEBER, OF CHICAGO,ILLINOIS, ASSIGNORS TO SAID KEARNS AND WEBER.

SPINNING-LATHE.

SPECIFICATION forming part of Letters Patent No. 240,145, dated April12, 1881.

Application filed January 10, 1881.

To all whom it mag concern:

Be it known that we, ISAAC F. KEARNS, FRANK BAIER, and CHARLES F. WEBER,all of Chicago, in the county of Cook and State of Illinois, haveinvented certain Improvements in Spinning-Lathes, of which the followingis a specification.

This invention relates to the devices for guiding the tool-carriage inspinning lathes,

wherein it is desired to form spherical, paraholoidal, or other curvedsurfaces in articles of sheet metal.

The nature of the invention lies in the manner in which the motion ofthe tool-carriage is controlled as to direction; and it consists in thenovel construction and combination of the parts, as hereinafterdescribed.

In the accompanying drawings, Figure l is a plan of a lathe to which ourimprovement has been attached. Fig. 2 is a bottom view of the carriageand slideway. Fig. 3 is an elevation of the carriage, the guideway, andthe feedscrew. Fig. 4 is a detail view of the slotted support providedfor the outer or free end of the feed-screw. Figs. 5 and 6 are detailviews of the feed foot and rollers attached to the carriage. Figs. 7 and8 are respectively longitudinal and transverse sectional views throughthe carriage and slideway.,

In the drawings, A represents the bed of the lathe, A the pulleysthereof, and A a form or mold secured thereto, and representing theshape. to be given to the article to be spun. In the drawings this partA is shown as a 3 5 paraboloid; but it may be spherical, conoidal,

or any similar form not requiring abrupt changes in the line to befollowed by the spinning-tool.

Secured upon the lathe-bed by any proper 0 supports, as s, is a curvedslideway, B, the curve whereof corresponds to the curve of the form'A-that is to say, to the outer line of a section taken upon the axialline of the form. Upon this slideway the tool-carriage O is re- 5ciprocated, and it is given a fixed and positive path of travel in thesaid slideway by the vertical rollers D depending from the carriage andrevolving along the sides of the slot in the slideway. These rollershave bottom flanges,

(No model.)

d, which project beyond the opening in the guideway, and thus serve tohold the carriage down firmly. The diameter of the rollers ap proachesthe width of the slide-opening, as nearly as may be, without creatingunnecessary friction, for obvious reasons.

At one end of the slideway is attached the feed-screw E by a head, E,held by a bolt, 0, or equivalent device, which will act as a pivot andallow a limited swiveling by the screw upon it. Depending from the otherend of the guideway is a support, E having a horizontal slot, 6, withinwhich the other end of the feedscrew rests. The feed-screw passesthrough a threaded opening in the foot F depending from the carriage,and reciprocates the carriage by means of said foot. That part of thefoot within the vertical dimensions of the slideway is surrounded by afreely-rotatin g washer or roller, f, which, like the rollers D, fillsthe slot and serves to keep the foot and. feed-screw 7o centrally in thepath at all points, so that the force of the screw is exerted in a lineparallel to the direction of the path, as nearly as may be, at alltimes. The foot F is held to a slide,

G, in the bottom of the carriage by a thread and nut upon its shaftportion. The slide permits it to change position by yielding in eitherdirection, whenever necessary, to prevent its binding against the sidesof the slideway B, and the thread-and-nut fastening permits it So toturn as the changes in the line of the screw prompt or require.

The carriage is provided with the usual toolholder, 0, carrying aspinning-roller, c, and with the ordinary adjusting-screws c and 0 The 85 rotation of the feed-screw forces the carriage along the guideway,which, as already stated, is constructed to conform to the surface ofthe form to which the metal is to be spun. As it proceeds in said paththe feed-screw aecomo modates itself to the changes in the line ofmovement by swinging laterally upon its swiveled end fastening, theslight swiveling of the foot F, the movement of the slide G, and theprovision of the elongated slot 0 permitting 5 this operation of thescrew.

Our invention permits the automatic performance of many operations inspinning heretofore always done by tools held in the hand of theworkman. It may be used in burnishing, polishing, and turning lathes bysubstituting appropriate tools for those kinds of work, and the feedscrew may be geared to the lathe, so as to.be automatic, if desired.-

carriage, of a curved slideway conforming to the mold or article to beformed and determining the path of the carriage, a screw for feeding thecarriage along said slideway, secured at one end only by a swivelingattachment, and a foot on the carriage engaging the feedscrew,substantially as specified.

3. The combination, with the tool-carriage traversing a curved slideway,substantially as shown, of a feed-screw secured at one end by aswiveling attachment, and a foot engaging said screw and secured to aslide in the carriage, substantially as set forth.

ISAAC F. KEARNS. FRANK BAIER. CHAS. F. WEBER.

Witnesses EDW. S. EVARTS, EVERETT BROWN.

